Hydroponics system-Nutrient Film Technique (NFT)
NFT provides no medium support for roots. Typically, roots sit in a long sloping irrigation channel (Fig 1.1). Nutrient is introduced at the high end of the channel and allowed to flow over the roots after which it drains into a nutrient reservoir. It is then re-pumped back into the channel to repeat the watering process.
This feed cycle can be intermittent or continuous. An ‘intermittent’ feed cycle is regulated by a timer and repeated many times per hour. It is sometimes termed “pulsed NFT”. Pulsed NFT usually achieves better aeration of roots because roots are exposed to air between each feed. A ‘continuous’ feed cycle runs non-stop. This is often used in commercial operations.